Up to now, for the reason of immature computational method and the complexity of flow-induced vibration in heat exchanger, although scientists research on its mechanism, there are still many faultiness and indistinctness in this field.
In the paper, the dynamic characteristic of tube bundles of heat exchanger, the mechanism of flow-induced vibration (vortex shedding, fluid elastic excitation), vibration control of tube bundles and the computational method of partial difference equation will be analyzed. It is useful discussion to ensure equipment’s operation and investment saving.
Then, the computational method which is suitable for numerical simulation of 3D viscous flow of whole passage and efficiency estimation for the preliminary study of hydraulic turbine retrofit project is studied under a preliminary Numerical Test Stand that is consist of commercial CFD software (Fluent) and commercial CAD software (Unigraphics CAD/CAM/CAE).
Distributed Measuring-Calculating Methods of Modeling Flows in Pipeline Systems
For modeling and identifying the distribution of homogeneous and heterogeneous flows in pipeline systems, measuring-calculating methods based on indirect measurements of the boundary conditions were proposed.
Effect (I) prevails and is estimated by two satisfactorily agreeing calculating methods.
The transfer mechanisms, calculating methods and ecological significance of nitrogen transfer between legumes and non-legumes are briefly reviewed.
The apparent viscosity, velocities distribution of laminar helical flow of power-law fluid are discussed and calculating methods of flow rate and pressure loss are presented.
A recurrent algorithm to calculate the stationary probabilities of system states was obtained, and a method of calculation of the stationary distribution of the waiting time before starting servicing of a positive customer was proposed.
A dual method of calculation of the optimal programs was presented.
Analytical Method of Calculation of the Temporal Characteristics of Ignition of Hybrid Gas-Solid Suspensions by a Heated Body
In the study we investigate the length of the inlet thermal segment, the heat exchange at the channel wall as a function of the wall temperature, and we also analyze the applicability of the suggested method of calculation.
A method of calculation is constructed for the Navier-Stokes equations using asymptotic expansions for high Reynolds numbers and matching techniques to join solutions (for example, ).